Vented vs non vented gas tank behind the seat. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chewychevy67 · 02-09-2017, 09:13 PM

I have a 67 and I am keeping my tank behind the seat. I remember in my old 67 that when the tank was full when you turned left I would always get a little spillage down the side of the cap on the paint and then would smell like gas. If I go to a 71 72 non vented tank does this still happen? What do I have to do to make this work correctly in my 67? Any info out there? Thanks in advance. Rod.

**LockDoc** · 02-10-2017, 12:12 AM

Quote:

Originally Posted by chewychevy67

I have a 67 and I am keeping my tank behind the seat. I remember in my old 67 that when the tank was full when you turned left I would always get a little spillage down the side of the cap on the paint and then would smell like gas. If I go to a 71 72 non vented tank does this still happen? What do I have to do to make this work correctly in my 67? Any info out there? Thanks in advance. Rod.

Not sure about the '71 but all '72 tanks were vented and the gas caps were not vented.... I don't think that's going to help your situation anyway. The leak would be between the cap and the neck.

LockDoc

slikside · 02-10-2017, 12:56 PM

Quote:

Originally Posted by LockDoc

Not sure about the '71 but all '72 tanks were vented and the gas caps were not vented.... I don't think that's going to help your situation anyway. The leak would be between the cap and the neck.

LockDoc

Exactly.

You can solve the issue with a new cap/gasket, or simply make another gasket out of some thin rubber, like a bicycle tire tube to supplement the existing cap/gasket. That's what I did a while back. Haven't had a problem since.

chewychevy67 · 02-10-2017, 01:19 PM

Good to know own thanks

**71CHEVYSHORTBED402** · 02-10-2017, 03:04 PM

Quote:

Originally Posted by LockDoc

Not sure about the '71 but all '72 tanks were vented and the gas caps were not vented.... I don't think that's going to help your situation anyway. The leak would be between the cap and the neck.

LockDoc

In other terms, the venting was through the vapor canister right Doc?

Seems with a canister you might be defeating the purpose by using a vented cap. That said, it probably doesn't hurt anything.

I read one post where they thought an earlier "vented" cap worked in one direction. I believe it was air in, not vapors out.

02-09-2017, 09:13 PM	#1
chewychevy67 Registered User Join Date: Jan 2010 Location: Here Posts: 5,535	Vented vs non vented gas tank behind the seat. I have a 67 and I am keeping my tank behind the seat. I remember in my old 67 that when the tank was full when you turned left I would always get a little spillage down the side of the cap on the paint and then would smell like gas. If I go to a 71 72 non vented tank does this still happen? What do I have to do to make this work correctly in my 67? Any info out there? Thanks in advance. Rod. Last edited by chewychevy67; 02-09-2017 at 09:19 PM.

02-10-2017, 01:19 PM	#4
chewychevy67 Registered User Join Date: Jan 2010 Location: Here Posts: 5,535	Re: Vented vs non vented gas tank behind the seat. Good to know own thanks



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